<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>基础的get请求</title>
</head>
<body>
    <h1>PPOST请求</h1>
    <form id="form" >
        <input type="text" name="name">
        <input type="text" name="age">
        <input type="text" name="sex">
        <button id="btn">提交</button>
    </form>
    <script>
    const oForm = document.getElementById('form')
    const oName = document.querySelector('#form input[name=name]');
    const oAge = document.querySelector('#form input[name=age]');
    const oSex = document.querySelector('#form input[name=sex]');
    const oBtn = document.getElementById('btn')       
    oForm.onsubmit = function () {
      //收集表单数据
      const nameValue = oName.value;
      const ageValue = oAge.value;
      const sexValue = oSex.value;

      const xhr = new XMLHttpRequest();

      xhr.open("post", "/adduser?a=1", true);

      //请求体的数据放在send中传递
      //因为请求体类型有很多,所以发送请求的时候一定要设置请求头的Content-Type类型
    //   xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
    //   xhr.send(`name=${nameValue}&age=${ageValue}&sex=${sexValue}`);

      xhr.setRequestHeader("Content-Type", "application/json;charset=utf-8")
      xhr.send(JSON.stringify({
        name: nameValue,
        age: ageValue,
        sex: sexValue
      }));

      xhr.onreadystatechange = function () {
        if (xhr.readyState === 4 && (xhr.status >= 200 && xhr.status <= 299)) {
          console.log(xhr.responseText);
        }
      }

      return false
    }
    </script>
</body>
</html>